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std::mktime

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< cpp‎ | chrono‎ | c

 
 
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Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
 
C estilo de utilitários de data e hora
Funções
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Functions
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Manipulação do tempo
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Time manipulation
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difftime
time
clock
Conversões de formato
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Format conversions
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asctime
ctime
strftime
wcsftime
gmtime
localtime
mktime
Constantes
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Constants
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CLOCKS_PER_SEC
Tipos
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Types
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tm
time_t
clock_t
 
Defined in header <ctime>
std::time_t mktime( std::tm* time );
Converte o tempo do calendário local para um tempo desde época como um objeto std::time_t, ignorando os valores de time->tm_wday e time->yday. Os valores de outros elementos de time não se restringem às suas gamas habituais. Um valor negativo de time->tm_isdst causa mktime para tentar determinar se o horário de verão estava em vigor.
Original:
Converts local calendar time to a time since epoch as a std::time_t object, ignoring the values of time->tm_wday and time->yday. The values of other components of time are not restricted to their usual ranges. A negative value of time->tm_isdst causes mktime to attempt to determine if Daylight Saving Time was in effect.
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Se bem sucedido, recalcula e atualiza todos os campos em time para caber suas escalas adequadas.
Original:
If successful, recalculates and updates all fields in time to fit their proper ranges.
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Índice

[editar] Parâmetros

time -
ponteiro para um objeto std::tm especificando o tempo de calendário local para converter
Original:
pointer to a std::tm object specifying local calendar time to convert
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[editar] Valor de retorno

Tempo desde a época como um objeto std::time_t de sucesso ou -1 se time não pode ser representado como um objeto std::time_t.
Original:
Time since epoch as a std::time_t object on success or -1 if time cannot be represented as a std::time_t object.
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[editar] Exemplo

Exibir o tempo de 100 meses
Original:
Display the time 100 months ago
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#include <iostream>
#include <iomanip>
#include <ctime>
 
int main()
{
    std::time_t t = std::time(NULL);
    std::tm tm = *std::localtime(&t);
    std::cout << "Today is           " << std::put_time(&tm, "%c %Z") <<'\n';
    tm.tm_mon -= 100;
    std::mktime(&tm);
    std::cout << "100 months ago was " << std::put_time(&tm, "%c %Z") << '\n';
}

Output:

Today is           Wed Dec 28 09:56:10 2011 EST
100 months ago was Thu Aug 28 10:56:10 2003 EDT

[editar] Veja também

converte tempo desde a época de tempo do calendário expressa como hora local
Original:
converts time since epoch to calendar time expressed as local time
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(função) [edit]
C documentation for mktime